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Q: In the life cycle of a star, the stage nebula refers to :
  • A. a cloud of dust and hydrogen
  • B. the outer shell of a star
  • C. the stage when the outer layers expand, cool down and become less bright
  • D. the last stage of its life
Correct Answer: Option A - A star's life cycle is determined by its mass. A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born. Over the time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin.
A. A star's life cycle is determined by its mass. A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born. Over the time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin.

Explanations:

A star's life cycle is determined by its mass. A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born. Over the time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin.